Hello,
This rash can be due to contact dermatitis, scabies, sweat dermatitis or folliculitis skin. Avoid using any lotions and creams for the meantime. Use a mild cleanser with moisturizing properties like Cetaphil. Also use cotton clothes and change the clothes twice if there is any increased sweating. Try keeping the skin free of sweat as far as possible. If the symptoms still persist then you can apply mild steroid like dermacort.For the itching antihistaminics like Benadryl or Claritin can be taken.
If the symptoms are severe then it will be best to consult a dermatologist
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.
What you've described could be anything from allergies to fire ants to herpes (not necessarily the genital variety). Have you changed the type of laundry soap/dryer sheets you use recently? It could also be Poison Ivy, Eczema, Psoriasis or a variety of other skin conditions. Also, flea bites can get pretty bad, especially if you've developed an allergy. My suggestion would be to scour the internet for pictures that look similar to your condition. Then you will have an idea of what you may be dealing with. If you're unsure and you can afford to, going to the dermatologist is your best option. If it's nothing, at least you have piece of mind.