Brief Answer:
Might be due to allergy causing agents in household, consult dermatologist

Detailed Answer:
Hi XXXXXX,
Thanks for writing in to us.

I have read through your query in detail.
Your symptoms need to be dealt with carefully and I would be glad to know how it all started, the first occasion seems to be due to a tiny black pin head sized ?worm fell on you and soon started multiplying and proliferating.

Since this is spreading all over, at first I would like you to consult a dermatologist to make certain these are not allergic reactions to any such substance at home that might be causing skin irritation and small bumps. Mold related infestations are also to be considered and the dermatologist might have to do tests to confirm it.

It does not look like a true parasitic infestation but then it will help to get an exterminator and clean your home from dust mites and any type of pests.

Please avoid scratching the skin areas to avoid further bleeding and pain. Apply calamine lotion to reduce itching and soothe the affected area. Since you also have symptoms in your scrotum it will help to wash your genitals twice a day with warm water and mild soap and wipe it dry. Please wear cotton inner clothes.

Hope this answers your question. Please feel free to correct any oversight in my interpretation of your problems and discuss them in detail as per your requirements.

Hope your query is answered.
Do write back if you have any doubts.

Regards,
Dr.Vivek

---