Groin pain - only when doing butterfly stretch type movements

I've had a a bit of a niggle in the nether regions since around Christmas. Somewhat strange as cycling doesn't seem to make it worse, but then again it virtually the only exercise I have been doing since the beginning of the year.
It doesn't bother me a great deal, but would like to get fixed at some point.
Basically it is quite/very painful when I rotate my hips outwards, as in the classic sitting butterfly stretch. It is also extremely noticeable when dismounting the bike. Oh, and it is painful on both sides.
I can stretch the hips in other directions with no pain. Also, I used to have no issues with butterfly stretches.
Any ideas, before I go and see a physio.
Thanks
It doesn't bother me a great deal, but would like to get fixed at some point.
Basically it is quite/very painful when I rotate my hips outwards, as in the classic sitting butterfly stretch. It is also extremely noticeable when dismounting the bike. Oh, and it is painful on both sides.
I can stretch the hips in other directions with no pain. Also, I used to have no issues with butterfly stretches.
Any ideas, before I go and see a physio.
Thanks
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NSAIDS, rest and being an otherwise fit 17 year old meant a fairly quick recovery for son.
I would get booked into see a physio.
Not entirely convinced as it is quite a sharp pain and came on relatively abruptly. Will give it a week or so and see if anything improves.
I only started using them towards the end of last summer. Am wondering if this might be the cause of the problem?