What should you know about black hard bump on skin?

A bump can look dark because of pigment, dried blood, a crust, trapped material or colour left after inflammation. Firmness may come from thickened surface skin or tissue deeper in the skin. Possibilities include an inflamed hair follicle, a plugged pore, a small keratin-filled bump, an inflammatory condition or another type of skin growth. Several unrelated problems can therefore share the same description.

Useful clues include where it started, whether it arose around a hair, how long it has been present, and whether its size, edge, colour or surface is evolving. Itching, warmth, tenderness, drainage and similar bumps elsewhere also help a clinician narrow the cause.

Do not squeeze, pierce, cut or burn the bump. Those actions can cause infection, bleeding, scarring and post-inflammatory darkening while making the original feature harder to assess. Wash gently, reduce rubbing from clothing or shaving, and use a plain dressing if the surface catches. A dated photograph beside a familiar object can help document change without repeatedly handling the area.

Book a clinician or dermatologist visit if the bump persists, enlarges, becomes irregular, develops several colours, repeatedly crusts or bleeds, or looks different from your other marks. Seek prompt care for spreading redness, increasing heat, severe pain, pus, red streaks or fever. Get urgent help if swelling affects breathing or involves the lips, tongue or throat.

Ask whether the bump arises from the surface, a hair follicle or deeper tissue, and whether magnified examination or a sample is needed. Confirm which treatments fit the suspected diagnosis and your skin type. If removal is considered, discuss the likely mark, pigment change, wound care and whether laboratory examination of removed tissue is appropriate.