Pregnant and just found blister on breast

[Tumblemum]

12 weeks pg today and blister type thing - is size of half a smartie red on the outside and white circle inside. Going to see doctor on Monday does this sound like breast cancer? Have read up and no information mentions blisters. If it is cancer can it be treated while being pregnant?

not sure what it is but i am pretty sure cancer doesn't manifest itself as a blister!

cat flea bite?

sounds like a pulled hair that has become infected...or does to me anyway.

thank you, it is just so odd looking does not hurt just come from nowhere