Indeed, it seems that cutaneous manifestations linked to Covid19 infections can be observed
– non-specific condition with redness and slight swellling and prurit (itching)
– frostbite type at the extremities of the fingers
These signs seem to always appear after other Covid19 infection symptoms: fever, cough, shortness of breath, loss of taste and smell.
If you have no such symptoms, those bites are not linked to a Covid19 infection.
Talking about « Cremicort », I am unfortunately not able to advise you further as I am not a dermatologist.