2 doctors weighed in:

I left my makeup(liquid foundation) in the car for a couple weeks. Will it cause me to breakout if I use it again?

2 doctors weighed in
Dr. Milton Alvis, jr
Preventive Medicine
1 doctor agrees

In brief: No easy/clear answer

All depends on the molecules within the makeup, routinely proprietary formulas with a huge number of molecules without any requirement for research data on health/disease responses; exempted by DSHEA Act of 1994.
Thus depends on how heat/oxygen in air might have altered the formulation & only trial & error (as in drug trials) to discover how you might respond differently.

In brief: No easy/clear answer

All depends on the molecules within the makeup, routinely proprietary formulas with a huge number of molecules without any requirement for research data on health/disease responses; exempted by DSHEA Act of 1994.
Thus depends on how heat/oxygen in air might have altered the formulation & only trial & error (as in drug trials) to discover how you might respond differently.
Dr. Milton Alvis, jr
Dr. Milton Alvis, jr
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