With filler, there can be some settling over the first 2 weeks, so I generally would not make a decision about dissolving the filler until that point. If the lump is at an injection point, it could be that it is disproportionately swollen from a bruise. I personally prefer using a microcannula for lip filler injections to avoid the bruising and excess swelling that comes with the traditional method of injecting the filler with a needle. It's less painful too! For now, one trick you could try is to take an ointment like Neosporin or Eucerin, lubricate the lump, then gently press between two fingers to flatten it out. Many lumps can be gently massaged out this way.
It is great that you are looking to start treatment early.....this is when you can make the most long-term difference. At this stage, you should focus on preserving as much hair as you can. A lot of hair loss is due to miniaturization of the follicles, so the hairs they produce are thin and don't provide as much scalp coverage. The goal is to save those follicles and restore their health so that that the subsequent hairs produced will be thicker. Once a hair follicle is dead, it's dead for good. The options that help restore follicle health are PRP (expensive, as you mentioned), low level laser therapy (such as the LaserCap), minoxidil (for the crown of your head) and finasteride (whole head). The LaserCap is usually around $3,000, so it's a significant up-front cost, but then you own it for life and it's easy to use. Minoxidil is available as a generic and much less expensive now (I buy mine at Costco in bulk). Finasteride can be made even less expensive by getting the 5 mg tablets and cutting them into 1/4's, and you may have prescription drug coverage that makes this even less expensive. Your 20's are when you will lose a lot of hair if you are prone to male pattern baldness. I would get a LaserCap, start taking minoxidil and finasteride, and try to keep as much hair as possible. Ten years from now, if there is still significant thinning or baldness, then maybe that hair transplant will be within budget. Good luck!!
It is quite common to have tiny bumps/breakouts for a few days after an Infini treatment. We generally do not treat them as they go away on their own without intervention. If it were to become more significant, topical antibiotics (like clindamycin) can be used, although we usually try to avoid this as the skin is sensitive for about a week after the treatment. Make sure your provider is aware of the bumps so that they can intervene if it does not go away after a few days. One week after an Infini treatment, we have clients restart their usual skin care regimen (like glycolic acid and retinol) which continues to turn over the skin quickly and accelerates the overall results. Good luck!!
I have completely switched to using microcannulas for lip filler because I think it gives a superior result aesthetically when molded/sculpted well. Plus, since a microcannula is much less traumatic to the tissue than a sharp needle, it almost never bruises and seems to swell a bit less than the needle method. The vast majority of my clients think the microcannula is less painful as well....though it is a bit strange the first time you try it. That said, expect lips to swell for the first 1-2 days after lip filler regardless of which technique is used. If this wouldn't work with your job, then I would wait until you have a couple of days off.