I have come to realize this could be a hickey, she sucked extremely hard, at one point was sensitive, and it does look like bruising spots and it explains why it would be at the tip. Plus a condom was used.
With trauma or force, red or purple discoloration may result. But if it persists, have this evaluated further for proper management . It is important to keep the area clean and dry. And observe for additional symptoms that may also be present.
Take care and keep us posted.
The spots started fading right away and I think they'll be gone within a few days.
Thx!