There are many different reasons which causes itchy bumps on the palms.The most common of the reasons are:
Since i presume you are having pompholyx,I would suggest you take antihistaminic tablet to control the itching.You can also try cold
compress along with topical steroid
cream.If the symptoms dont subside in 1week,kindly consult your dermatologist
for complete examination and treatment.
Hope it helps,