Found an interesting post about minoxidil and its effects on the skin:
"There are more than 30 studies on Minoxidil's effects on collagen production and fibroblast proliferation. (The latter of which is the nastiest)
https://www.ncbi.nlm.nih.gov/pubmed/8383644
https://www.ncbi.nlm.nih.gov/pubmed/8112995
https://www.ncbi.nlm.nih.gov/pubmed/8311472
https://www.ncbi.nlm.nih.gov/pubmed/2826267
https://www.ncbi.nlm.nih.gov/pubmed/2850865
If you want more in depth looks at those studies rather than just the Abstracts, then just message me and I can give you the PDF's.
It inhibits Lysyl Hydryoxylase, an important enzyme in collagen production. And, if stops fibroblasts from proliferating, AKA dividing. This means you have a smaller fibroblast cell count. Most people putting minoxidil on twice a day every day are overdosing on the drug, especially if they are doing it for extended periods like 6-12 months. The sides tend to last for a few months to a few years after Minoxidil is removed from your system, because minoxidil is a free-radical and edits cells at a transcriptional level (basically giving you misfolded proteins, which takes a long time for your body to clean out)
Lack of collagen means a paler skin tone, perhaps a greyish skin tone, dark circles around the eyes because your bones are showing through, forehead wrinkles, frizzier/darker hair, bushier looking eyebrows, and thinner eyelashes. "