She immediately received a flurry of responses from helpful users, who encouraged her to apply roll-on deodorant to the affected area.
"Deodorant saves my life when it's hot AF and wearing a dress...minimises chafing and lasts longer than lotion or cream," wrote one user.
"I used roll on stick deodorant today on my inner thighs and the chafing significantly reduced and it was great," added another.
Britain's record-breaking weather is set to end as a band of thunderstorms is expected to sweep across the UK bringing torrential downpours and gale force wind.
Severe weather warnings are in place overnight and throughout Thursday, with a cold front set to bring heavy rain and thunderstorms to parts of southern Scotland, northern England, north Wales and the Midlands.
This week has seen the second hottest June day since records began 167 years ago, with temperatures claiming the lives of four people and resulting in "unprecedented demand" for ambulance services in London.
But the Met Office as now warned of the potential for torrential downpours, frequent lightning, large hailstones and strong gusts of wind, which could lead to localised flooding and temporary disruption of power supplies overnight until early on Thursday.