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The symptoms you have described of having rash & itching behind the legs & elbows can be due to various causes.The most common causes are: fungal infection,allergy or psoriasis.
Following is recommended for you now:
-Take tablet benadryl once a day.
-Apply cream containing 1 % hydrocortisone.
If the area is large then apply Calamine lotion.
Also apply cream clotrimazole
This will reduce the rashes/spots & itching.All these medications are available at your counter without any prescription & will help you greatly.
If still after this,the symptoms persists.then you need to make an appointment with your doctor as prescription oral medications will then be required accordingly.Usually & most likely,the symptoms gets subside with these treatment & doctor visit is less likely required.
Hope this helped
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