Brief Answer:Allergic reaction
Thanks for posting your query on HealthcareMagic.
Development of reddish purple rashes on bottom of feet after grass cutting is suggestive of an allergic reaction.
It is difficult to name a particular plant which could have caused the allergic reaction.
The rash could be due to some insect bite also.
A clinical assessment is required at the first place.
Anti-allergic drugs like anti-histamines are usually prescribed for this kind of allergic reaction.
If the rash does not disappear even after drug treatment, some other cause has to be found out for the symptoms.
Usually bleeding disorders cause purple to reddish purple colored rashes.
However, the possibility of allergic reaction is more because the rash developed soon after exposure to grass.
If you have more queries, I will be glad to answer.
Dr Shailja P Wahal