It's not clear what "小a" is. If "小a" is a person's name and you mean to treat a health issue of this individual, it depends on the specific illness.
If it's a cold, they can have plenty of rest, drink warm fluids like herbal tea and take over - the - counter medications for symptom relief such as painkillers for headache or cough syrups.
If it's a skin problem, like a rash, they should keep the affected area clean and dry. They might apply a suitable ointment recommended by a doctor or pharmacist depending on the cause of the rash, such as an anti - fungal or anti - inflammatory one.
