###Human: Does a large mole like discoloration indicate something? ###Assistant: Hi. I have gone through your case. In my opinion it is a rapid growing mole. As you have decribed, it was not there almost a year ago but now it has grown to this much size. I am not making you tensed but any mole which grows rapidly is a matter of great concern. You need to get a biopsy report as early as possible. The great concern is to see if any melanoma is developing in it. Any mole which has any of the following sign must need an urgent biopsy. 1. A: asymmetry. 2. B: borders irregular. 3. C: color change. 4. D: diameter greater than 5 mm. 5. E: evolving. My advice to you is to see your local dermatogist as early as possible. Do not take it easy until unless melanoma is ruled out. Skin biopsy.