thanks for using healthcare magic
I would be pleased to answer your question .
You should avoid pressing it further and never press on such a boil again . The dark mark is bound to stay for awhile. you should visit the doctor / dermatologist
who will give you an intralesional triamcinolone
injection in the area . They might also put you an oral course of antibiotic like azithromycin
250 mg daily for 3 days along with lactobacilli capsules
Thanks and take care