There are various ways to avoid pimples and oral ulcers.

First of all about oral ulcers:

You should avoid hot and spicy food items, since there are several individuals who develop oral ulcers by taking such type of food. Keep your mouth neat and clean, and get any good mouth wash from the pharmacy. The mouth wash can be used twice daily or as per requirement. Make this your habit to keep your teeth clean. Brush your teeth twice a day once after breakfast, and second before going to bed in the night. Oral ulcers may also be developed due to some infection in the oral cavity. It is therefore necessary to take any oral medication or antibiotic. If your oral ulcers do not resolve by domestic measures seek the doctor's help so that he can prescribe you some good antibiotic and ulcer reliever.

As for as pimples on the skin are concerned, first of all it is necessary to tell you that people are more concerned about the pimples that are developed on the face, rather than those pimples which are developed on the tummy. Therefore, if these pimples are small and do not bothering you, there is nothing to worry about them.

In order to get rid of pimples, you will be required to take some topical medications, lotions, creams and antibiotics like tetracyclines. The treatment modality is different for every case and depends upon personal variations. It is again useful to consult a doctor in person (dermatologist) for the resolution of your problem.