Bumps on mantle?

[MSB123]

I recently got this clam, and I have been noticing these bumps on its mantle. What are they?
A little info, I’ve had it for 3 days, it is very reactive to when I walk by the tank and when fish swim over it.

 

[DSC reef]

It's just the mantle, nothing to worry about. Nice maxima

 

[MSB123]

Thanks!

 

[MSB123]

I did this time lapse yesterday!

 

[MSB123]

 

[MSB123]