Clean Glow Scalp is a grooming and product site. The guidance here is general information to help you look after a shaved scalp — it is not medical advice, and it isn't a substitute for a doctor or dermatologist.
Skin on the scalp can develop problems that look minor but aren't. See a dermatologist if a spot or patch changes, grows, bleeds, scabs and won't heal, itches persistently, or just looks different from the others. Sun-damaged skin in particular needs a professional eye, because some changes can be early skin cancer and are very treatable when caught early.
Nothing on this site can diagnose a condition or promise to remove or cure anything. If you have a specific concern — an allergy, a persistent rash, hair loss, or a reaction to a product — talk to a qualified professional.
Use products as directed on their label, and patch-test anything new before putting it on your whole scalp.