Acute urticaria.
Your body is responding to allergies like for any infection, inhalation of dust , ingestion of food &drugs, infestations ( worm), implants, pscychological etc.
Use antihistamines likes desloratine + montoleukast (dazit-M) daily night for 2 weeks.
Tab.bandy plus 1tab stat (just only 1 tab strat). After food night
Calosoft plus lotion local application on rashes & itchy regions.
Next Steps
If not subsiding check the following investigation & meet the dermatologist
CBC with AEC,
LFT, RFT, SERUM
LIPID PROFILE, URINE ROUTINE, FBS.
All this helps to rule out any systemic cause is there?