Maltese wit Maltese

Thank you everyone for all your responses, it helped to keep me calm I have a vet appointment on thursday so hopefully its nothing but he is 14 (human) years old.

Today I came home to find a spot of dry blood on my Maltese X Shitzu front leg. A closer look and I found a lump pink-ish in colour. I wasn't sure if it was a tick so I thought I should try to rinse in some warm salt water, before picking it off. When I submerged his leg in water and dabbed with a paper towel the dry blood came away instantly and it began to bleed. This is the best pic I could get. Can anyone offer some advise?? Please!