When the blood vessels increase in number it may cause small bumps on the skin which are called Pyogenic granuloma. These are not cancer causing cells and occur commonly on children. Earlier, the reddish lumps were believed to be of bacterial infection but later it was found that it is due to the increase in blood vessels.
Unlike vascular tumor, these types of lesions do not cause cancer and they are classified as polypoid or exophytic lesions that are benign. These lumps may cause bleeding on the skin even for minor injuries but they can be completely cured by surgical process.
Causes :
Exact cause is still not known but pyogenic granuloma may appear in the form of red lesions on the skin after trauma or minor injury. It is observed as small red colored lesions on the face, hands and arms of young children.
Pyogenic granulomas may occur due to hormonal imbalance or due to angiogenic factors. Actually the lesions have been tested for the presence of HPV virus but not a single test shows the presence of virus.This begins to appear on the skin suddenly after a fall or injury on the hands or face. Even skin burn can be a cause for the occurrence of these lesions.
It can be due to the process of angiogenesis in which nitric oxide synthase is secreted which may trigger growth of lesions causing pyogenic granulomas.