Hi, welcome to healthcaremagic. First of all, don t be panic as cancers have tendency to grow rapidly. If it shows red, black, blue colours, it may be a vascular malformation. Sometimes, similar features are also seen in a neavus which is present since birth. You can get an ultrasound done to understand the underlying disease. If, it comes to be vascular malformation, it can be managed with excision or sclerotherapy. In case it is a lipoma or other solid tumour, it can also be excised simply. So, once the ultrasound of the lesion is done, you can see a general surgeon for sorting out the correct management of the problem on the basis of the ultrasound report. Hope, you get well soon.