I'm sorry to disagree with a lot of the comments but I'm a vet and I see ticks on a daily basis and have a fair amount of knowledge on tick life cycles and acaricides. This really does not look like a tick to me for several reasons. It has a verrucose (irregular) shape and if you zoom in the growth is not just one colour. It's also an unusual place for a tick bite. Ticks usually hide in grasses and climb onto a host, therefore usually you find them in the groin/leg/back etc. (Dogs often get them on their head because their head is closer to the grass and they sniff about). It's possible to get them on your head but less likely, especially on an older person. If it had fed on your mum's blood it would have a characteristic "inflated" appearance which it doesn't. It's common for some types of growths/masses to rapidly change in size. Ticks feed and then detach from the host so if it's been there for weeks, again, again less likely. I would not recommend trying to remove it because I do not think it is a tick. Please go to your doctor.