I have recurring lumps under my arms in different locations that come on rapidly, red, tender only relief is to pop.  No pus they are filled with dark blood.I have similar on my inner thighs.  They occur in the same location and have been there for some months.  Doctor did not want to remove them said it would cause more harm than good and gave antibiotics.These swell up to the size of golf balls and then bleed out.  I have to squeeze them in the shower at least every couple of days just so i can continue to walk.
HI.IN medical language this is called HY Chat Doctor.  And this is due to inability of that particular skin for not coping with hormonal changes. If the medical management fails to resolve this condition then surgery is a good option. As this type of surgery is rarely performed, it may be an exercise for you to find someone who does this. Get a Consultation of a Surgeon. You may try something like Doxycycline 100 mg once a day with water for a long time say 1 to 4 weeks if you are not allergic to this. Sometimes this helps. Apply liquid provide iodine locally to the affected area thrice daily; this may help to stop the recurrent infection. Take multivitamins to give skin a support.