It happens to the best of us you catch your reflection mid-morning only to discover a mysterious bump that wasn’t there yesterday. The instinct to squeeze, pick, or pop it can feel almost irresistible. But board-certified dermatologists are united on this: step away from the mirror.

Popping any kind of skin bump breaks the skin apart, leaving it vulnerable to infection and potentially making the problem far worse than it originally was. And for those who can’t resist, the consequences go beyond a bad skin day, prolonged healing and permanent scarring are real risks, according to dermatologists at Mount Sinai West.

The right treatment always depends on what’s actually going on beneath the surface. Most bumps respond well to expert-approved over-the-counter products, while others require professional in-office intervention. Here is a breakdown of 18 of the most common skin bumps, what causes them, and what to do instead of picking.

 Cystic acne

Cystic acne forms deep beneath the skin as a painful, red nodule that is notoriously difficult to treat with drugstore products alone. The accompanying inflammation can permanently scar the skin and attempting to pop it will only result in a bloody spot since the cyst sits far too deep to reach manually. It is caused by hormonal fluctuations and acne bacteria that trigger an overproduction of oil, which ruptures beneath the skin and spreads inflammation to surrounding tissue. Treatment options range from cortisone injections administered by a dermatologist to prescription antibiotics, hormonal birth control, and photodynamic laser therapy.

Milia

These tiny white bumps clustered around the eyes and cheeks are not filled with dirt or oil they are small, harmless cysts formed when dead skin cells and keratin become trapped under the skin. They are essentially un-poppable at home, and trying to force them will leave skin red and irritated with the bumps still firmly in place. A dermatologist can extract them using a sterilized heated tool, or a retinoid cream can help smooth them out gradually. They often resolve on their own with time.

Ingrown hairs

When a hair shaft becomes trapped beneath the skin’s surface, the result is a red, itchy, inflamed bump that looks deceptively poppable. Squeezing them only deepens the inflammation and leads to red marks that can linger for months. Treating the area with hydrocortisone and washing with a glycolic or salicylic acid based exfoliant helps the hair reach the surface. A dermatologist can also nick the skin and remove the hair or inject steroids to reduce swelling for persistent cases.

Skin tags

These small, fleshy growths typically appear on the neck, underarms, and groin areas prone to friction. Attempting to remove one at home causes pain, bleeding, and potential infection. A dermatologist can safely remove them through cryotherapy, cautery, or surgical removal, and in cases where they are large enough to interfere with daily life, insurance may cover the procedure.

Cold sores

Cold sores caused by the herpes simplex virus should never be touched or popped under any circumstances. The fluid inside contains the live virus, and popping one can spread it to other parts of the face or to someone else entirely. Minor sores can be managed with over-the-counter antiviral treatments, but frequent outbreaks more than six times a year warrant a prescription from a doctor for more aggressive preventive medication.

 Dermatosa papulosa nigra (DPN)

These brown or black bumps, which closely resemble moles and appear predominantly on the face and neck, are most common in people with deeper skin tones. They are entirely genetic and pose no health risk. However, those bothered by their appearance can seek in-office removal through options including laser treatment, cryosurgery, or electrodessication. People with deeper skin tones should discuss post-care carefully with their dermatologist to minimize the risk of pigmentation changes.

 Keratosis pilaris

Commonly nicknamed chicken skin, this genetic condition results from a keratin buildup that plugs hair follicles, creating rough, sandpaper-like bumps most often on the arms and thighs. Picking worsens redness and increases scarring risk. Chemical exfoliants containing salicylic and glycolic acid can gradually smooth the area, and prescription tretinoin, pulsed dye laser, or chemical peels are available through a dermatologist for more stubborn cases.

 Blackheads and whiteheads

Both are caused by pores clogged with oil the only difference is that blackheads have been exposed to air, causing oxidation. Squeezing either type forces bacteria deeper into the skin. Salicylic acid and retinol-based products promote cell turnover to prevent future clogs, while adapalene gels work to bring blackheads to the surface without manual pressure.

 Seborrheic keratoses

These wart-like, raised bumps range in color from dark brown to grayish black and appear most often on sun-exposed areas. They are completely benign, though they can feel scaly or catch on clothing. Because they can resemble certain types of skin cancer, a dermatologist visit is worthwhile for confirmation. Treatment options include cryotherapy, electrocautery, or removal by scalpel, and insurance may cover procedures if the bumps become irritated.

 Lipomas

A lipoma is a soft, moveable lump formed by a fatty deposit just beneath the skin. Genetically linked and non-cancerous, lipomas are generally harmless unless they grow large enough to cause pain. Despite what popular skincare videos might suggest, attempting to pop or rupture one at home is a bad idea. A dermatologist can remove them safely using laser or excision techniques that minimize scarring.

 Cherry angiomas

These bright red bumps are made up of small blood vessels and tend to appear on the face, chest, and back. Their cause is not fully understood, though genetics play a role and they often appear or multiply after pregnancy. Since they contain blood, attempting to pop them is particularly inadvisable. Dermatologists can remove them quickly and cleanly using laser or cautery treatments.

Sebaceous cysts

These skin-colored bumps are filled with a keratin-based material and tend to develop in areas with a high concentration of oil glands. While typically benign, they can become painful if inflamed or infected. A dermatologist can inject them with steroids to reduce inflammation or surgically remove the entire capsule to prevent recurrence.

Rosacea

Rosacea is not always just redness it can also appear as pus-filled or crusted bumps that closely resemble acne. It can even affect the eyes, causing redness and irritation. A chronic inflammatory condition, rosacea has no cure but can be managed with topical or oral antibiotics, vasoconstrictors, and laser or intense pulsed light treatments. Avoiding common triggers such as heat, stress, alcohol, caffeine, and spicy foods, along with using a mineral-based sunscreen daily, can help keep flare-ups in check.

Eczema

Eczema presents as dry, itchy, inflamed patches that should never be scratched doing so triggers a response that can worsen the condition. It encompasses several types of inflammatory skin disorders, the most common being atopic dermatitis, which compromises the skin barrier and allows irritants to penetrate. Fragrance-free moisturizers applied within minutes of bathing, lukewarm showers, and avoiding rough fabrics can all support prevention. A dermatologist should handle diagnosis and may prescribe topical steroids or other anti-inflammatory treatments.

Warts

Caused by the HPV virus and spread through skin contact, warts are common but should not be picked at doing so can spread them to other areas. Treatment options available through a dermatologist include salicylic acid, liquid nitrogen therapy, lasers, and injectable immunotherapy.

Boils

A boil is a pus-filled bump caused by a bacterial infection, most commonly staph aureus. Picking at one introduces more bacteria, worsening the infection. Proper treatment typically involves professional incision and draining, followed by antibiotics when needed.

 Keloids

Keloids are thickened, raised scars that are more common in people with brown or Black skin and often develop after piercings or other skin trauma. They result from how the skin responds to injury. Board-certified dermatologists can treat them with steroid injections, laser therapy, or surgical removal.

 Sebaceous hyperplasia

These small, yellowish, doughnut-shaped bumps tend to appear on the forehead and center of the face with age, caused by an overgrowth of oil glands. They are often mistaken for pimples but are completely harmless. Dermatologists can treat them with electrocautery, laser, or cryotherapy for those who want them removed.

When to see a dermatologist

New bumps are not always cause for alarm, but the threshold for booking an appointment with a board-certified dermatologist should be low. If an over-the-counter treatment has not resolved a concern, if a mole or bump has visibly changed, or if there are signs of infection, it is time to make the call. A yearly full-body skin cancer screening is also worth scheduling regardless of visible concerns it is always better to get a definitive diagnosis than to guess.