Noticed a random bump on the back of your shoulder? Before you start overthinking, it could be a skin cyst. These small, round lumps often develop beneath the skin and may feel soft, firm, or slightly movable. Most skin cysts are harmless, but their size and appearance can vary. Sometimes they stay tiny for years, while others slowly grow and become more noticeable.
A cyst on the back shoulder can develop when skin cells become trapped beneath the surface, forming a sac filled with keratin. Epidermoid cysts are a common example. Friction from clothing or backpacks may irritate an existing cyst, making it more uncomfortable. And yes, that tempting urge to pop it? Definitely skip it. Squeezing can cause inflammation, infection, or scarring.
Most shoulder cysts aren’t a big deal, but some deserve attention. If the bump becomes red, warm, painful, swollen, or starts leaking fluid, it could be inflamed or infected. A rapidly growing, hard, or fixed lump should also be checked by a healthcare professional. Not every shoulder bump is a cyst, so getting the right diagnosis matters more than guessing based on appearance.
Treatment depends on the cyst’s size, symptoms, and diagnosis. Small, painless cysts may not need treatment at all. A warm compress can help ease mild discomfort, but it won’t necessarily remove the cyst. If the cyst keeps growing, becomes painful, or repeatedly gets inflamed, a dermatologist may recommend professional removal.