Aphthous ulcer is a painful ulcer of mouth cavity.  white area surrounded by a red line , round in shape and flat . It is too much painful and seen on the cheek mucosa, palate, tongue, floor of the mouth and even oesophagus.

The Aphthae those are small and heals without scar is called "Minor" Aphthous and those leave a scar after healing is called "Major " Aphthous.

Both type is very painful and takes 8 to 10 days to heal completely.
This ulcer is auto immune , but aggrevated by mental stress , vitamin deficiency etc.

When you are in very much mental pressure , may be at office , or school college exam , or stressed at home with spouse or parents or children , problems in love affair or any other kind of mentally stressed , you may have that kind of ulcer .

It is seen in some dogs who are too much anxious ( watch Dogs) , they develop such ulcers in their oesophagus . Later they die of that ulcers.

treatment : Treatment is not necessary , but to alleviate pain you can have pain killer , but it does not work for a long time , so can have Tetracycline mouthwash , and to avoid secondary infection rinse with warm saline 3 ice daily.

But tetra cycline mouthwash is good . It causes reduce pain and infection too.

If you don't find Tetracycline mouthwash , you can make it at home .
Just take a Tetracycline Capsule , open or cut the capsule and mix some of it's powder (the yellow powder inside the capsule ) with cold or normal water (no warm water) , then rinse and it is very bitter in taste. Mix a little amount , a large amount powder may cause your mouth another irritation or ulcer.

You can take vitamin B12, iron and folate  for some days , scientist say this is also may be a cause of painful Aphthous ulceration. 

Nowadays some dentists prefer laser treatment , but some say as it is a very invasive process , they don't recommend.

There is an ointmenet name "Pyralvax" , you can try that also , but it is only for some hours to reduce pain .

Tetracycline mouthwash is very effective .

I develop Aphthous when I travel and go to a distant place , like if I go to picnic.