Hello,
This can be due to a viral infection or bacterial infection causing folliculitis, skin rash and pus formation. Apply warm compresses,Neosporin ointment and calamine lotion and avoid messing with it. You can take anti-inflammatory pain killers like ibuprofen or acetaminophen. If the lumps persist then it will be best to get it evaluated from a dermatologist.
I hope it helps. 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.
Looks to me a viral rash. Any contacts had herpes or chicken pox in neighbourhood? Drug rash could be similar.Do consult your doc.