Welcome to HCM
Muliple red spot with itching or without itching could be some kind of allergic rash
that is Urticaria
which may be because of some food or other allengen.
Anti allergic medication may give relief,but these rash sometimes may be because of a viral infection and may be manifestation of low platelet count
,so it would be prudent to see a Physician/Dermatologist
to exactly know what they are and can be treated accordingly.
please take care
Good Luck to you