Welcome to HCM.
The one good thing you did was stop wearing your contact lens
And to make it clear Iris is a structure which is deep inside the eyes. So, I am thinking of your white spot in either the conjunctiva(the white part of the eye)/ limbus( the part of the eye near the conjunctival corneal junction).
Pingeculitis is very common cause of redness
, which increases on exposure to heat and dusty areas.
Since you are a contact lens wearer, it could be a Phlyctenular keratoconjunctivitis
an allergic hypersensitivity
reaction. In either case it needs a confirmation by slit lamp examination and anti inflammatory eye drops/ short course of steroid
eye drops. Stop wearing the contact lens until your eyes are completely free of redness.
Confirm it with your eye care provider to get a permanent relief. Until then you can use a lubricant to soothen your eye.
Hope this helps. Take care :).