Just to add - when I read some years ago that skin tags were a sign of underlying insulin resistance (IR) - I talked about this as something to watch out for, for my adult children, re their increased risk for the dreaded T2. Especially my child who shares my tendency to gain weight primarily around the waist, but it's an alert I put out to both of them. They know of course, that the alert is so they then can lower the amount of glucose-forming food in their diet, and yes they know what that is! (Whew.) My extended family on the other hand are barely indulgent of my alerts to watch out for, but one does what one can.
BTW, my dad also has been plagued with skin tags, and the brown marks around the neck. He also has the big firm belly that shows bloating, as I did pre just lowering glucose forming food and LCHF. He did not have blood glucose issues, but I did try to talk him into avoiding wheat products (as I am clearly sensitive to so the chances are that he is too...) and ultra processed vege oils, but to no avail. (I did a great presentation of butter over margarine, but I can't override the anti saturated fat brigade, sadly.) He developed rheumatoid arthritis which has an association with too-high glucose forming food (a 2000 study) (I remember this as I wrote it, told it, and tried.... sigh). He developed this very late in life, but oh boy has it lowered his quality of life.
Yeah - tell your family members, if you have that indicator of IR, to watch out for skin tags and the discolouration around the neck, for sure. (And just to add - switch to almond flour baked goods and real butter straight away!! imho.)