I think it may be categorized with the fear of holes/clusters. Trypophobia.
Bumps
mood
These bumps are called nodules
Tachophobia is the term that most phobia lists use to refer to the fear of speed.
the bumps on the moon are called craters which has happened by comets and other objects.
The red bumps on a turkey's head are called CARUNCLES.
They are called milk glands(bumps) prepares baby's milk
Warts
They are called manarilose
osteoderms
Goose bumps, also called goose pimples, goose flesh, chill bumps, chicken skin, people bumps, or the medical term cutis anserina, are the bumps on a person's skin at the base of body hairs which involuntarily develop when a person is cold or experiences strong emotions such as fear or awe.
The "bumps" you refer to are called the "lobes". They are a precise size that allows the valves to open and close correctly in an engine.