Hi Varsha Roy
As the rash is associated with itching and on lower limbs it is looking like Papular Urticaria
which may be due to some allergic reaction
Nothing to worry and you can apply calamine lotion over the rash thrice daily and on raw areas you can apply antibacterial cream like mupirocin ointmeny thrice daily.
For itching oral antihistmines like hydroxyzine
can be given thrice daily in prescribed dosage.
as skin conditions are duagnosed accurately by clinical examination and appropriate treatment can be given.