Table 3: Topics present in posts. MC = molluscum contagiosum.

Topic Label	Unigrams	Example Post Title
HSV	herpes, outbreak, virus, ingrown_hair, pimple	“Herpes or infected follicles?”
HPV	hpv, high_risk, wart, vaccine, cancer	“Does this look like HPV?”
Symptoms	fordyce_spots, sti, std, symptoms, blister	“Fordyce spots, ppp, or std???”
Symptoms	bumps, small, itchy, look_like, clear	“Should I be worried about these bumps?”
Crowdsourcing	help_identify, concerned, opinion, worse, idea	“Could anyone help me identify this?”
Help seeking	help, reddit, figure, doctor, scared	“Please help! Kinda scared”
HIV	hiv, risk, condom, exposure, oral_sex	“Risk of getting HIV from bleeding gums”
Chlamydia	chlamydia, treatment, tested_positive, doxycycline, azithromycin_	“Can doxycycline cure chlamydia that I just got yesterday”
Genital warts	wart, tyginta, acv, treatment, look_like	“Can I share Tyginta with my boyfriend even if he hasn’t got warts yet?”
Symptoms	penis, redness, shaft, dry, worry	“Bumps on Penis, Really worried”
Warts	genital_warts, lookJike, terrified, tyginta, treatment	“Genital warts? 7 months pregnant - never had an std before - terrified.”
Testing	test, results, got_tested, negative, positive	“Can the results of the OraQuick test be trusted, especially if they are negative?”
Solicited sex	worried, prostitute, changes, girlfriend, sti	“I had unprotected sex with a prostitute. Should I be worried?”
Symptoms	bump, small, ingrown_hair, pimple, doesn_hurt	“Have this bump for almost 3 months now. Should I be alarmed?”
Risk	unprotected_sex, years, partners, months, tested	“Is there a place to get tested asap?”
MC	molluscum, vinegar, cured, spread, wondering	“Molluscum? Other? Help please”
General questions	sex, unprotected_oral, safe, worry, used_condom	“Freaking out! Had sex with a stranger.”
Possible STDs	got, noticed, painful, need_help, possible_std	“Help with a possible STD.”
Crowdsourcing	ideas, months, week, noticing, years_ago	“Had for over a week now...Any ideas?”
HSV	hsv, genital, oral, testing, contract	“Contracting HSV-2 indirectly through group sex?”
Symptoms	rash, red, itchy, inner_thigh, help_identify	“Single rash on pubic area.”
Crowdsourcing	opinion, thought, tested, seeing, going	“NSFW - Your opinion on what’s going on”