Hi..
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concerns..
As per your complain it seems that your sister has got chemical burns on face due to application of garlic over the
pimples and leaving it overnight..
It has led to inflammation due to burning of the skin..
I would suggest that she should not try to rub the skin or remove the burnt skin as it can lead to scar as well as dark spots on skin..
As of now she can simply wash the area gently with
cold water and do cool compresses over the area to reduce inflammation and pain..
She should
consult a Dermatologist and get evaluated and he can advise her to apply
steroid based ointment over the area to reduce inflammation, pain as well as heal the lesion..
Avoid sun exposure..
Do not apply and harsh skin cosmetics as it can worsen the condition..
Hope this information helps..
Thanks and regards.
Dr.Honey Nandwani Arora.