Growing a Bang and Other Questions

I have accumulated several questions: a. Is it permissible to grow or maintain a bang (and if forbidden, to what extent), or is there an issue of following the customs of non-Jews? b. Is it permissible to clean the face with soap (liquid, of course) specifically for acne (teenage pimples) on Shabbat, when my goal is both to treat and prevent new pimples (because I almost always wake up on Shabbat morning with new pimples), and also to clean the oily face? Or is it considered healing? c. Is it permissible to pass in front of someone praying if there is a partition, and can one take steps when the person praying is behind, of course, with closed eyes? Does a folding seat attached with hinges count as part of ten tefachim? d. More than a year ago, I joined a WhatsApp group where each person receives names of others to pray for their complete recovery for 40 days (the idea is that whoever prays for his friend is answered first), and in fact, I did not do everything mainly because I lost the page with the names and always forgot to rewrite it. Can I or am I obligated to still complete it, and if not, what is the correction for such a thing? Sorry for the length, I don't have time to clarify these things. Thank you.

Peace and blessings 

a. The Mishnah Berurah (Siman 27, Se'if Katan 15) writes: "I am displeased with the practice of those who grow bangs, aside from it being a way of arrogance and pride, see what is written in Yoreh De'ah, Siman 178, it is forbidden due to the placement of tefillin." And there in the Shulchan Aruch it is stated that the prohibition is due to following the customs of non-Jews.

b. It is considered healing and is forbidden. 

c. It is forbidden to pass even if there is a partition, if it does not hide the passer from the eyes of the one praying (Mishnah Berurah, Siman 102, Se'if Katan 2). 

d. If you can obtain the names to pray for, do so.