Bumps on the scalp can be caused by other skin disorders such as folliculitis, scalp acne, or dandruff. They could also show up due to an allergic reaction to a product or skincare routine.

The differential diagnosis includes pityriasis rosea ... are generally used as a body wash that is lathered on the scalp and affected skin for 5 to 10 minutes daily and then rinsed off.

Pityriasis rosea is a common skin condition that causes a set of temporary red, scaly rashes. These mild rashes aren't contagious and usually clear up without medical treatment in 10 weeks or less.