You could be having a mite infestation called scabies. Fourderm type of creams won't do any benefit. There is a proper course of the therapy. The problem can be confirmed by having a look at few pictures of yours
Next Steps
upload a few pictures to confirm the diagnosis
Health Tips
the mite is very contagious. it can spread between family members and friends very easily. so you should get the treatment as early as possible.