Scab Formation (Crusting)

Scab formation, also called crusting, describes the dried layer of blood, serum, inflammatory fluid, and cellular debris that forms over a healing wound on the scalp or skin. It commonly follows minor cuts, abrasions, insect bites, inflammatory conditions, or dermatologic procedures; scabs are usually firm, brownish or yellowish, and indicate that the body is sealing and protecting the underlying tissue while new skin forms.

Most scabs resolve on their own with gentle cleansing and time, but thick or long-lasting crusts can trap bacteria and delay healing. Avoid picking or forcefully removing scabs because this can cause bleeding, infection, or scarring; seek medical advice if a scab is accompanied by increasing pain, spreading redness, pus, fever, or if it does not improve over several weeks so that appropriate cleansing, topical treatment, or further evaluation can be provided.