You should keep a rash moist as keeping a rash dry can make inflammation and itching of the rash worse.
You can keep a rash moist by applying some Vaseline or petroleum jelly or some moisturizer like cream or ointment several times a day to help soothe the rash and help promote healing of the rash.
You can also apply some Aloe Vera to the rash and wash the area often with water only as soap can make the dryness and itchy worse and then pat dry the rash.
A rash that won't go away or keeps coming back can be contact dermatitis, hives "urticaria", eczema "atopic dermatitis or even a result of allergies, irritants and other medical conditions.
Not all rashes are serious and many rashes eventually go away and are harmless but if they persist and get worse you should see a doctor to determine the exact cause of the rash.
Possible causes of a rash that keeps coming back include contact dermatitis, hives, atopic dermatitis or eczema, psoriasis, seborrheic dermatitis, infections, systemic conditions, and certain medications.
In rare cases the rash that keeps coming back could be skin cancer but most often the rash is a result of less serious conditions but it's still a good idea to get the rash checked out.
Underlying medical conditions such as Kawasaki disease, rheumatoid arthritis and lupus can lead to skin rashes.
Certain viral, fungal and bacterial infections can cause skin rashes which can come and go.
Psoriasis is a lifelong skin disorder which causes thick, scaly patches that occur often on the knees, elbows and scalp.
Seborrheic Dermatitis is a chronic condition that causes inflamed, flaky patches, that often occurs on the scalp and face and it can go away and then come back.
Hives or Urticaria are raised, itchy, red bumps which can move around on your skin.
Hives can also be triggered and caused by infections and allergies and other medical conditions which often come and go.
Eczema which is also known as atopic dermatitis is a chronic skin condition that causes itchy, red and irritated skin.
Eczema can also be triggered by various things and often flares up and causes the rash to reappear.
Contact dermatitis is a condition that occurs as a result of an allergic reaction to something that you touched, such as a chemical, substance or even an ingredient in something.
The rash with contact dermatitis often appears and disappears as you continue to avoid the allergen.