thanks for the query
can you please mention your age, sex and any associated disorder if you have?
the problem above you mention appears to be granuloma annulare
or ring worm(fungal)infection.ring worm infection
can be detected easily by KOH TEST or biopsy
.also this infection associated with itching and these lesions are of size around 4 to 5 cm and occurs in groups of 3 or 4.. but granuloma annulare not associated with any other symptoms, size around 1.2 to 2 cm.its cause is unknown.
so its better to consult your dermatologist
and get fully examined
accordingly treatment can be given