I am having some pain near my left knee while biking. The pain is in the side towards the back (see the highlighted line in the attached picture). The highlighted circle is where there is some restriction after the long ride. There is no problem during running and swimming.
Background: I am training for the Houston 140.6 race and have had a solid 6 months of training under my belt including Austin 70.3 in October 2017. This pain surfaced after my 83 mile ride on Saturday, February 3rd. After that, I did a 3 swim workouts and couple of runs (16 miles and 7 miles) with no issue. I also biked slowly for an hour on my indoor bike. It wasn't bad. So, I did another 75 mile ride on Saturday, February 10th after taking an ibuprofen. The pain has resurfaced.
Could you please advice on how to resolve this?
Aspiring 140.6 Triathlete