I would like to know how old is your baby. Is there any fever
/ altered behaviour as in irritability etc/ cough/ runny nose ? What is the nature of the rash
- papule /pustule/ petechiae(pin point small red dots)/ vesicles ( small blisters). If any of these symptoms are present , it would be better if you take your baby to the paediatrician.
If it is just a patchy reddish rash associated with itching it is most likely due to an allergic cause. You could give her anti histamines
( medication that you normally give her for cold
). I cant really comment on the drug or dosage as of now , since I dont know the age/weight of the baby. Apply calamine
lotion onto the area of rash. Calamine lotion application will be soothing to the child. Normally this kind of rash should go away in a day . However , if this rash is associated with any fever /excessive crying/ cough/sorethroat/altered behaviour/ if the rash persists for more than a day, please consult with a paediatrician immediately. Hope this helps. Hope your baby gets well soon :)
If you have any queries , kindly get back to me .