skin condition and how to deal with strangers?

Hey all, any advice on how to deal with strangers talking about your skin as a topic for small talk?

I have Ichthyosis and I have a lot of blemishes and it’s very noticeable on my face, arms legs and hands and ears.

People tend to make a comment about how “hot it is outside “ and how “sunburnt” I am or mention they know someone who has psoriasis or eczema and that such and such cream might help or that my skin looks red/dry have you tried using creams/lotions/ointments.. or that I look really tired or dehydrated. I never ONCE asked lol.

I tend to go along and answer or panic and say I have a skin condition or pretending I’m actually really sunburnt to avoid being awkward or “rude” if I shut it down.

Basically I just want to know how to stand up for myself but I find it hard to know what to say or do when it happens and it catches me off guard every time despise it happening soo often.

what happened to just saying hello? Or talking about my outfit or idk something casual that isnt about my body??

thanks for reading I needed it off my chest and would appreciate any advice