The rash is infected. If you have an itchy rash and you scratch it, it may become infected. Signs of an infected rash are yellow or green fluid, swelling, crusting, pain, and warmth in the area of the rash, or a red streak coming from the rash. Rashes can come in many forms and, depending on the cause, take days or even weeks to heal. Sep 28, · The rash may form a pattern on the back that resembles a Christmas tree. Pityriasis rosea usually goes away without treatment in four to 10 weeks, but it can last months. Medicated lotions may lessen itchiness and speed the disappearance of the rash. Often, though, no treatment is required.
Aug 13, · Other possible causes of rashes include the following: A rash can sometimes develop in the area of a bug bite, such as a flea bite. Tick bites are of particular concern Eczema, or atopic dermatitis, is a rash that primarily occurs in people with asthma or allergies. The rash is often Psoriasis.