<P> Ulcers may also appear on the cheeks, soft palate, the tongue, and on the inside of the lower lip . These ulcers usually last from 7 to 14 days and can be painful . </P> <P> Different types of discharges from ulcer are: </P> <Ul> <Li> Serous, usually seen in healing ulcer </Li> <Li> Purulent, seen in infected ulcer . Yellow creamy discharge is observed in staphylococcal infection; bloody opalescent discharge in streptococcal infection, while greenish discharge is seen in pseudomonas ulcer </Li> <Li> Bloody (sanguineous), usually seen in malignant ulcers and in healing ulcers with healthy granulation tissue </Li> <Li> Seropurulent </Li> <Li> Serosanguinous </Li> <Li> Serous with sulphur granules, seen in actinomycosis </Li> <Li> Yellowish, as seen in tuberculous ulcer </Li> </Ul> <Li> Serous, usually seen in healing ulcer </Li>

What is an open sore or lesion in the skin