Hi welcome to health care magic forum. You have given meltus linctus in the morning and histatussin inthe evening to your child of 16 months. One of the componants of the medicine you have given are allergic to the baby, so stop those medicines immediately and approach the doctor to change the medicines.
If you dont want to go to the doctor , you stop meltus linctus and continue histatussin. if it is still there you stop this also. Then the rash
may dis appear, if it did't resolve, it is a must to see the doctor for relief of the bumps.
Wishing for a quick recovery and thanks for calling.