Hi welcome to H.C.M.F orum. it appears to be UTRICARIA caused by allergic reaction
of the body to the allergin may be from out side like pollen, sort of plants, or insects etc. from inside like food we take sea foods, fruits, or vegetables occur only in this season. you observe the things you come across with which you get such reaction. i advise you to consult a physician for diagnosis & treatment.
avoid sea foods, brinjal, etc. dont worry you willbe fine.