"The Monster", a 1970 short story by R. Chetwynd-Hayes, was reprinted in Fantasy Tales, Spring 1991 which is available at the Internet Archive. The story seems also to be the answer to this old question on the Science Fiction & Fantasy Stack Exchange.
A young woman is in hiding in a house, kept there because she is hideous / bestial and human society would attack her.
"Child, can you not see?” The Uncle snapped out the
question. “Put out your hand. Now I will lay mine alongside.
Look. Mine is shaped by the Almighty, yours ... Do not
force me to describe what your eyes must see. Look at my
face, then feel your own, the skin — the monstrous growth
that covers your head. Can’t you understand that I feel sick in
your presence, and I have gazed upon you for nigh on sixteen
years. Think how that young man would react were he to see
you as you are. He would hand you over to the temple elders
for burning, as indeed I should have long since."
She is in love with the gardener at the house, peeking at him from hiding, admiring his 'strong back' and other fine features as he works.
The sin in Caroline’s heart became a canker, and Satan
Atomo, no doubt gloating over his conquest, made sure
temptation was always before her. The young man seemed
to live in the garden. He hoed the black earth that glowered
beneath the linen-white flowers, he trimmed the dark green
grass with a scythe, and all the time his naked brown back
screamed its untranslatable message to Caroline, so that
her mind became a hothouse of searing, forbidden thoughts.
She kept away from the window for as long as she could,
walked round and round the room, and prayed silently to
Almighty Jehovah for forgiveness, but always, whenever
her attention flagged, she came back to that fatal hole in
the curtain.
She escapes and is hounded down and killed by a mob. As they kill her they recite a pseudo religious litany about how repulsive and dangerous 'beasts' like her are,
The priest raised his voice to a near scream.
"And what shall there be on the head?"
"There shall be two ears."
"And how shall the ears be shaped?"
"They will be large, and black, and shall hang down, even
to the shoulders."
"And what shall be on the face?"
"There shall be two eyes, one large, one small, and two
noses, and twin tusks will grow forth from the cheeks, and
the lips shall be black and spread wide, and the teeth shall
never be covered. Thus saith the Almighty Jehovah."
"And what shall be on the hands?"
"Two fingers, and they shall have talons, even as the
feet hath two toes, and a small tail, not more than twelve
inches long, shall hang from the spine, even as Jehovah has
decreed."
but in describing the features of these beasts it becomes apparent that she is a beautiful young girl, and the mob are adorned with horns, etc.
Caroline was crying now, not because they had lighted the
faggots, but because she could see her reflection in the bronze
mirror. She was ugly — it was good that all this ugliness was
about to be burnt. She had no lovely brown wrinkled skin;
hers was obscenely white and smooth; her head, instead of
being nobly domed and ridged, was covered with a grotesque
mop of corn-coloured growth, which covered her horrible
small ears; she only had one nose, and her eyes were both the
same size, but, and this was worst of all, not delicately addled,
but blue, surrounded with white, and fringed by the same
hideous growth that marred her head. Each hand had four long
fingers and a shorter one that stuck out at an angle, and there
were five toes to each foot. Her lips were red, not black, and
covered her teeth, which should have been irregular, one
behind the other; hers were disgustingly white and even.
