Heat bumps.
could be an infection coming and a sign of the first stage of a cold coming
If its a ka thunk sound even on small bumps,Its most likely your STRUT MOUNTS.
Red bumps on your thighs with white stuff coming out of them indicates that you have an infected rash. This requires immediate treatment with antibiotics to prevent it from spreading and affecting other parts of your body.
Friction is created when bumps from two surfaces come into contact, which resists motion and generates heat.
Heat is coming from the engine.
it's called heat rash
The red bumps on the back of the neck below the hairline are typically associated with a rash. This often occurs due to heat.
Might be heat rash - if you've been sweating or in hot conditions, this is a common area to get heat rash. Your description of the small bumps are consistant with heat rash.
heat coming from where? heat from a fire isnt, heat from the sun is.
You could have a heat rash.
It sounds like a heat rash, you should check it out Benadryl will help.