I have a skin condition (psoriasis) and am considering starting to quantify the number and total surface of the spots on my skin in order to relate these to several factors of my life (stress, weight, activity, sleep, etc). Another factor that is suggested to influence this condition is sunlight, and I do have the idea it might be an important factor.
I am therefore considering quantifying how much time I spend outdoors and/or how much sunlight I caught each day. The first thing that came to mind was to use a self-questionnaire, but I'm not sure how valid this measurement would be. Estimating the time spent outside could introduce bias, but also how I was dressed during my time spent outside and therefore how much skin was exposed to sunlight.
Another option I am considering is using the Life Cycle app that tracks your position using GPS and quantifies how much time you spend on the road, at home, at work etc. However, for some reason it doesn't register my runs (ca 5 km) and just says I were at home, so I can't fully rely on it.
Does anyone have any suggestions on how to quantify these aspects? Thanks for your thoughts!